Matrix problem

  • Thread starter losmets90
  • Start date
  • #1
3
0
Given the matrix
A= [a 1 9]
[a -6 3]
[5 -8 a]

find all values of a that makes
4a602ec89d76de74a9e73df5c71e221.png

give your answers in increasing order.
a can be _ & _

NEED HELP! IM BEYOND STUCK! I have no idea to even approach this problem! Thanks!
 
Last edited by a moderator:

Answers and Replies

  • #2
194
0
I don't understand why you are stuck.
You don't know how to calculate determinants or solve equations?
 
  • #3
3
0
I don't know how to solve the equation
 
  • #4
194
0
[tex]\[
\left| {\left. {\bf{A}} \right|} \right. = 285 - 48a - 7a^2 = 0
\]
[/tex]
You can't solve that?
 
  • #5
3
0
oh, now I feel dumb. Thanks for the help!
 

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